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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'af10c7e977201657c40814613b6975af16071e057bea36830d85f8461bb3cb31' 
  AND token = 'KYkykHeZZLVu0SYE/Oq4sCF+AiOI8yLI/JJ18CLsAeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}